Sorption characteristics and heat storage performance of MgCl2/13X zeolite composite sorbent

doi:10.11949/j.issn.0438-1157.20161402

Abstract

Abstract:

A novel high performance composite heat storage material is prepared by using 13X zeolite as the porous substrate,using magnesium chloride as reactive salts.Its adsorption performance and heat storage properties are researched experimentally.Scanning electron microscope(SEM) is utilized to characterize the microstructure and morphology of composite materials.Automatic specific surface and porosity analyzer(ASAP 2460) is utilized to measure pore volume of the composite materials.Adsorption performance of composite materials is measured in constant temperature humidity chamber.Experimental data show adsorbance of the composite material with 29%(mass) MgCl₂ reached 0.75 g·g^-1.The influence of salt contents and relative humidity on the absorption performance of the composites is analyzed.Laser flash diffusivity apparatus(LFA)is used to measure the thermal diffusivities of pure zeolite and composites.Synchronous thermal analyzer(STA,one kind of TG-DSC instrument)is utilized to measure energy storage density of composites,results showed the composite material with 29% MgCl₂ reached 1628 kJ·kg^-1 and its volume storage density reached 412 kW·h·m^-3.Heat storage density of three kinds of adsorption processes(physical adsorption,chemical absorption and absorption of zeolite/MgCl₂ composite material) are quantitatively analyzed.

Key words: 13X zeolite molecular sieve, MgCl₂, composite adsorbent, adsorptive property, heat storage density

摘要：

制备了一种以13X沸石分子筛为多孔基质材料、氯化镁为反应盐的高性能复合吸附储热材料，并对其吸附性能和储热密度进行了深入研究。使用扫描电子显微镜（SEM）对复合材料的微观结构和形态特征进行了表征；使用全自动比表面积与孔隙度分析仪（ASAP 2460）测试了复合材料的孔体积；使用恒温恒湿箱对复合吸附材料的吸附性能进行了测试，其中含盐量29%（质量分数）的复合吸附材料达到了0.75 g·g^-1的平衡吸附量，探讨了含盐量和相对湿度对复合吸附材料吸附性能的影响规律；利用激光热导仪（LFA）测试了纯沸石以及复合吸附材料的热扩散系数；利用同步热分析仪（STA）测试了复合吸附材料的储热密度，其中含盐量最高的复合吸附材料质量储热密度达到1628 kJ·kg^-1，体积密度高达412 kW·h·m^-3，定量地分析了氯化镁/沸石复合材料耦合物理吸附、化学吸附与吸收过程的多形态储热密度。

关键词: 13X沸石分子筛, 氯化镁, 复合吸附材料, 吸附性能, 储热密度

CLC Number:

TK02

XU Jiaxing, LI Tingxian, WANG Ruzhu. Sorption characteristics and heat storage performance of MgCl₂/13X zeolite composite sorbent[J]. CIESC Journal, 2016, 67(S2): 348-355.

许嘉兴, 李廷贤, 王如竹. 氯化镁/沸石复合材料的吸附特性及储热性能[J]. 化工学报, 2016, 67(S2): 348-355.

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Sorption characteristics and heat storage performance of MgCl₂/13X zeolite composite sorbent

氯化镁/沸石复合材料的吸附特性及储热性能

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